package com.stack.wemedia.gateway.filter;


import com.stack.wemedia.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
/**
 * @author llz
 * @date 2023/10/12 14:45
 * @description 自媒体端网关
 */
@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //判断是否是登录
        if(request.getURI().getPath().contains("/login")){
            return chain.filter(exchange); //放行
        }
        String token = request.getHeaders().getFirst("token");
        if(StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //判断token是否有效
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token); //获取payload body信息
            int result = AppJwtUtil.verifyToken(claimsBody); //是否是过期
            if(result == 1 || result  == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
            Object userId = claimsBody.get("id"); //获取用户信息
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId", userId + "");
            }).build(); //存储header中
            exchange.mutate().request(serverHttpRequest); //重置请求
        } catch (Exception e) {
            throw new RuntimeException("请重新登录！");
        }
        return chain.filter(exchange); //放行
    }

    /**
     * 优先级设置  值越小  优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
